Jack



H. H. LAMPERT JACK Filed Oct. 29 1923 Patented 0a. 28, 1924.

UNITED HENRY n: nmrnn'r, or cmc ae'o, .ILLmoI s.

JACK.

Application filed October 29, 1923. Serial No. 674,487.

To all whom itmaly concern:

Be it known that I, HENRY H. LAmER'r, a citizen of the United States of America, and a resident of Chicago, .in the county of Cook and State of Illinois, have invented a new and .useful Improvement in Jacks, of which the following is a specification.

This invention relates to jacks particularly suitable for adjusting shores in building construction. The objects of the invention are to provide a jack conveniently arranged for adjustably supporting a vertically extending post or shore so as to virtually form a continuation of the post but'to provide for its convenient and rapid vertical adjustment, and to provide an im-' proved jack construction of thistype allowing for both a rapid approximate preliminary setting of shores prior to the ap lication of weight thereon and for a fine a justment of the shores, either before or after the shores are loaded with the weight to be Supported. a

It is also the ob ect of the invention to provide an economical but highly useful jack particularly designed for use in sup porting the temporary forms for the concrete floors of a building.

The objects of the invention are accomplished by the construction shown in the drawing, in which: i

Figure 1 is a perspective view of the improved jack, and Figs. 2 and 3 are respectively fragmentary details in side elevation illustrating how a transversely extending post-supporting shelf is mounted in the frame of the jack.

The construction as illustrated preferably comprises a hollow vertically extending frame member adapted to receive the rectangular posts commonly employed for the shores of a building. This frame member is preferably formed of vertically extending angle bars to embrace the corners of the supposed posts. These angle bars are connected together at their upper ends by transversely extending plates. and their lower ends by a suitably anged castin to which the bars are bolted or rlveted. T is casting is also provided with a centrally locate boss which is threaded to receive the screw of the jack, the screw having a separate base to whichit is swiveled. The vertically extending angle bars have opposed slots which serve'to receive at different locations along the frame a transversely extending shelf preferably in the form of a T-bar. In the use of the ack this transversely extending shelf is placed in the frame at a suitable location to give the approximate desired height to the shore or post, and then the screw is adjusted to give the final exact setting of the shore. The vertically extending.

angle bars are spaced apart so that diagonal braces may be nailed to the post atnearly any point without interference by the jack.

Referring to the drawin av vertical screw 1 is shown as having t v e swivel connection 2 with a supporting base 3. This screw, as isusual in jacks, is provided with a head 4' having transversely extending apertures for receivin a bar for turning the screw. The screw w ich has threaded en-' gagement with a centrally located boss 5 in a casting 6, which forms the base of a shorereceivlng frame which, besides the base, comprises the vertical angle bars 7 and the tie-plates 8 riveted to the upper end of the bar 7. The base 6 is formed to rovide shoulders 9 upon which the angle 1rons 7 rest. The angle irons are boltedor riveted to the base 6 through the vertical flanges 10 thereof. The angle bars 7 have opposed slots 11 along the r inner edges for receiving a transverse shelf at any desired point along the length of the frame. This shelf;

is preferabl in the form of a T-bar, as shown, and is provided with a rivet 13 for limiting its inward motion in the frame, and

the shore assuming an angle with the jack or of shiftin laterally thereof.

- Although ut one specific embodiment of this invention has been herein' shown and described, it will be understood that numerous details of the construction shown may receiving frame prevents any possibility of he altered or omitted without departing from the spirit of this invention as defined by the following claim.

I claim: 1

5 A jack comprising a hollow rectangular frame structure formed of a plurality of vertical angle ironsysaid angle irons being tied together at their upper ends by transverse plates secured thereto, and at their 10 lower ends by a. supporting casting to which the angle irons are also secured, a centrally located threaded aperture in said casting, a

screw engaging said casting at the threaded aperture, and a supporting base for said screw with which the screw has a swivel connection, said vertically extending angle irons being provided with opposed horizontal slots at different points along their length, and a transversely extending T-bar resting in opposed pairs of said slots.

Signed at Chicago this 26th day of October, 1923.

7 HENRY H. LAMPERT. 

